[geeks] Ultra 2: what's U1401?

[Mouse]

I've got an Ultra 2 that fails POST.  But the error is cryptic enough I
can't tell whether it's anything reasonably fixable.  I'm wondering if
anyone can tell me, or point me towards doc that can tell me.

The error I'm seeing is

0>APC Test
0>    APC Registers Tests Test
0>    APC DVMA Test
0>ERROR: TEST=APC,SUBTEST=APC DVMA ID=16.2
0>Component under test: APC U1401
0>    Unexpected event occured
0>    Data Access Error from address 00000000.001319c0
0> tl  tt         tstate                 tpc               tnpc
0> 01  63  00000011.80001603  000001ff.f004bd24  000001ff.f004bd28
0>    AFSR 00000000.00100000
0>    (CE) Correctable ECC Error
0>   SDBH[143:72] Syndrome is c8. CE Error on bit 67
0>    SDBH = 00000000.000000c8 SDBL = 00000000.00000060

I found 802-2561-11.pdf, but it's little help.  The block diagram on
page C-2 seems to indicate that the APC is purely for audio.  C-29 has
another diagram, but all that does is tell me it's not a RAM stick (the
"Correectable ECC Error" part made me hope it was RAM).  So far I
haven't found anything in there that actually helps me.

.idprom output is, I suspect, characteristic of a dead battery:

ok .idprom
Format/Type: ff ff Ethernet: ff ff ff ff ff ff Date: ff ff ff ff 
Serial: ff ef ff Checksum: ff 
ok 

It occurs to me that a dead battery could cause POST failure, but if so
it's unexpected to the POST author; it complains about U1401, while the
NVRAM is U2006.

I've tried to reset the MAC, but whenever I try mkp or mkpl it wedges,
needing a hard power-cycle.  The machine does have a disk in it, but
when I try to "boot disk -s" I get

Boot device: /sbus/SUNW,fas at e,8800000/sd at 0,0  File and args: -s

and it wedges there.

Any thoughts?  I'd hate to send this off to the scrapper if it doesn't
deserve it, but I also don't want to beat my head against the wall of
trying to make broken hardware work.

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